Grinding-machine.



1.1. THACHER.

GRINDING MAcHyNE. APPLICATION FILED MAR. 8,' 19l'5 v 1,176,180, v,Patented Mar, 21, 1916.

5 SHEETS-SHEET l.

K. VM

J. THACHER.

GRINDING MACHINE. APPLICATION AFILED MAR. s. 1915.'

5 SHEETS-SHEET 2.

Patented Mar.

lzf/vaf J. THACHER.;l

vGRINDING MACHINE.

. APPLICATION FILED MARS. |915. 1,176,18@ Patented Mar. 21, 1916.

5 SHEETS-SHEET 3.

.141. THAGHER;

` GRINDING MACHINE. APPLICATION FILED MAR. 1915.7-

g Patented' Mar. 2l, 1916.

L w mw 1.1. THACHER.

GRINDING MACHINE.

APPLlcATloN man MAR. 1915` 1,176,180. Patented M111'. 21, 1916.

5 SHEETS'v SHEET b.

y marsan i .m inout am ff dir itlifhlirllj itl/@limo JOI-IN J'. THACHEP., O" ATTLEBORO, MASSACHUSETTS, ASSGNOR TG BROWN a SHABPE MFG. C0.. Ol PROVIDENCE, RHODE ISLAND, A. CORPORATION 0F RHODE. ISLAND.

mma-Mm Application filed March 8, 1915.

To all whom t may concern.'

Be it vknown that l', JOHN J. Timoniere, a citizen oit' the United States. residing; at ttleboro, in the county of Bristol and State of Massachusetts, have invented certain new. and useful Improvements in Grinding-Machines; and l do hereby declare the followina to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appel-'nains to malte and use the same.

The invention relates to grinding' machines. and more particularly to means for controlling the speed of rotation' of the work, and the speed o'l' the relative travel of the work and grinding wheel.

In the grinding machines now on the market, considerable dilliculty is often experienced in obtaining the proper adjustment of the mechanism for rotating' the work to the relative travel of the work and grinding wheel in order to secure the best combination of speeds for effecting satisfactory results; and this is true whether the work be made to travel past the ,grinding wheel, or whether the work rotates upon a stationary support and a corresponding` relative move* ment of the lgrinding wheel be effected. To obtain the best results the speeds employed should be those best suited tothe character of the work, and it is highly desirable that the changes and adjustments requisite for securing such speeds should be quickly and intelligently made. y

lt is the object of the present invention to regulate and adjust independently the rate of said speeds` to render said control and adjustment readily accessible to the hand ot the operator. to indicate clearly at all times the number of rotations per minute otl the work and the rate oi'l the relative travel of the work and Yrindinnr wheel` to render the starting and stopping' mechanisms effecting said rotations and relative travel independent of the grindinr wheel mechanism. and in ygeneral to simplify the parts and combine the movements ot such mechanisms in such relation as to obtain the most economical and eective results.

ln its preferred form. the invention is embodied in a grinding machine having two independent variable speed mechanisms, one for rotating` the work and the other for etfecting the movement of the work longitw Specification of Letters Patent.

Patented Mar. lill, lllt.

Serial. No. 13,020.

dinally past the grinding wheel. Each of said variable mechanisms is actuated by two series of friction disks, one series beine;n mounted upon a stationary driven shaft and the other upon a movable driving,- shaft, and operatively in contact as is well known in this type of mechanism. rThe controlling means employed consists of two independent concentric shafts, one of which is arranged to adjust the variable speed mechanism actuating the work, and the other ot which is arranged to adjust the variable speed mechanism actuatingthe table, each of said shafts being connected with one of two concentric dials mounted at the front of the machine, and operated by levers within convenient. reach of the operator. ln close proxnmty to said dials is also the lever con nected with means for stopping and starting the said variable mechanisms.

The features ot the invention will be readily understood from an inspection ot the accompanying drawings, and the tcllowirrt;w detailed description of the machine illusl trated therein.

In the dra wings, Figure l is an end elevaltion of a grinding machine embodying the invention in its preferred form; Fie. 2 is a. view of the interior of the variable speed case, the back cover thereof beine; removed; Fig. 3 is a horizontal section oi the said speed case and connections taken diagonally through the bearings of the main shaft and controllingr mechanism: Fig. i is vertical section of the speed case, the dials and controlling* mechanism; Fig. 5 is a plan view ot the dials, the operating handles, and the starting` and stopping' lever; and 6 is a vertical section of the dials shown in Fig. 5 through the operating: handles thereof.

The frame 7 ot the grinding machine ernbodyinp; the invention is provided with the usual wars 8, movable carriage 9, table 10 carried thereon Jfor supporting;r the head and toot-stocks, and the usual grinding wheel 1l, which is suitably connected with some source of power. As here shown. the carriage and table are moved longitudinally and the said grinding wheel is mounted upon a transversely movable carriage which is held against movement in a direction longitudinal ot the table, but as is obvious, the movement of the table relative to said grind ing wheel could also be accomplished by having the table stationary and effecting a correspondii'ig travel of the grinding wheel carriage.

The variable speed mechanisms for rotating the work and for effecting the longitudinal feeding movement of the table is contained in the case l2 which is located at the rear of the machine and is normally closed by the cover 13. Within the case .12, the shaft 14 is iouinaled in suitable bearings secured within the valls thereof7 and is connected t0 the pulley l5, which is located on the outside of said c: se and is connected with some suitable'source of power 1G by the belt 17. Connected with said shaft 14E by means of the swinging hearings lh and 19 is the eountershaft E() carrying the friction disks 2l and the gear 22. which meshes with the gear 23 carried upon the shaft ll and is operated thereby. Similarly connected to the shaft 1l. bv means of the swinging bearings 2l and 25 is the shaft 2h carrying thereon the friction disks 27 and the gear 28, which meshes with the gear 2i) mounted upon the shaft l-'land is operated thereby.

The work is rotated by means ot' the pulley ll1 adjacent thereto. which is connected by the belt -l-O to the pulley 35) which is mounted upon the shaft 2%, located above the machine. Upon said shaft 38 is also mounted the pulley 37 ivliicli is connected by a belt 3G to the pulley 35 mounted upon the end of the shaft El() outside of the case l2. Upon the shaft 30 journaled in suitable beariiigs in the lower portion of the walls of the case are the friction disks 3l, engaging with the series of friction disks 27 in the manner well-kiiown in the art, and being` free to move longitudinally upon the square portion 52 of the shaft BO. rl`he series of friction disks 27 and Bl are kept in close engagement by means of the inovalile sleeve il actuated by the spring 8l.

The usual mechaniiii is ein iloved for ef- 1 i fecting` the longtudinal inoveiiient of the table and is connected by means of the chain titl to thesprocket i7 mounted upon one end of the shaft 4Q, which is mounted in suitable beai'ings in the wall of the upper por tion of the case l2. The shaft '12 carries upon the square shaft portion i3 thereof the friction disks Llll which are operatively in contact with the friction disks 2l and are held in cli'isc engagement therewith by means of the inovabie sleeve l5 and the spring 46. For the purpose of stopping and starting each of the said mechanisms for rotating the. work and moving the table` there is pivotallv mounted on the rear wall of the case l2 the lever -Clt?. the arms 4) and 50, which cari-v the blades :Vil and 52 rcspectively'. the blade 5l engaging with the annular flange :33 unoii the sleeve 'li. and the blade 52 engaging with the annular. flange 54 upon the sleeve fili-3., and each of said sleeves having respectively the disks SQ and S3 integral therewith.y and arranged to en- `nage respectively with the brakes Si and 85.

-Upon sutlicient pressure being exerted by said bladesiipon the said flanges, the pressure of the said helical springs upon the sleeves will be stopped, thereby releasing the close eiigagement of the frictional disks which have been operatively in Contact, and

at the saine time the disks 82 and Si?) integral 76 with said sleeves will be brought in contact with the brakes adjacent thereto, thereby stopping further rotation of the shafts lL and 3f. Also connected with said lever iS is th\y ariii 55 having therein the groove 80 5h engaging with the linger 57 mounted iipoii a rocking shaft 58 joiirnaled in suitable beariiigs, one of which is located in the rear wall of said box (see Fig. 2), and the olher of which is connected with the bracket 70 (see Fig. (t). The shaft is actuated by a hand lever secured thereto iii close prob;- iinity to the handles controlling the dials hereinafter described and within convenient i reach of the lefthand of the operator. Also ,90 located within the case. il is the mechanism for changing and adjusting the relative positions of the movable driving and the driven shafts. Mounted upon the main shaft llit is the yoke (32 which is also connected y9.5 through the swinging bearings 18, 19fto the` shaft '20 and mounted iipon said yoke l62 at oneI side thereofV is the gear segment 60 which meshes with the beveled gear Gel, mounted upon the central shaft G5. Also 19o mounted upon said shaft 1l is the yoke (33 which is also connected through the swing ing bearings 24, to the shaft 26, and mounted upon Said yoke 63, at one side thereot'.y is the beveled gear segment (il which 105 meshes with the beveled gear (36 carried by the hollow shaft (i7.

For controlling and varying the speeds from the front of the machine, concentric shafts G5 and 67 are employed. The hol- 110 low shaft 07 is mounted within the sleeve G8, one end of which is secured to the case 12 by means of the socket. (3S), and the other end of which is secured to the bracket 70, which is mounted upon the face of the main 116 frame. rThe hollow shaft (37 is connected with the collar "il which is secured to the hub of the dial 72 turned bv the lhandle 7:3 marked ltlead The shaft G5 is keyed to the hub 74 of the dial 75, the said dial being 120 concentric with the dial 72 and turned by the handle 76 marked Talble In order to provide the. operator with a rcadv means for ascertaining` the speed of rotalicn of the work aiid the speed of the. longitudinal travel of the table. a scale is provided unon the face of each dial. the figures ol dial 72 indicating the/available speeds in revolutions per minute. for the rotation of the work, and the Figures of dial 75 in- 130 tirarse dieet-.ing toe available speeds in inches per minute for the longitudinal movement of the tahle, and a double pointer Si being carried upon the rim 78 of the disk 77, which iocated between the said dials and which integral with the bracket 70 and thereby secured against rotation. For the purpose holding the parts securely in any adjusted position, the rim "ZS is provided upon opposite sides with the teeth 79 and fi() which are engaged by spring pressed detent pawls 79 and 80 mounted respectively in the adjusting dials 72 and 75. To prevent accidental displacement of the adjusting dials the pawls are normally locked in engagement with the. teeth. Ag shown, the pawl 79" is thus locked by a spring' pressed locking; pin T3. to the outer end of which the handle 73 is secure l. The inner end of the pin is provided with a flange bearing against the detent pawl 79. and is also provided with a projection which extends back of the rear end of the detent and locks it in engagement with the teeth v79 until the operator draws the handle T3 outward, preparatory to adjusting the dial Z'E'Z and connected parts. The detent pawl SO is normally locked in position by a similar springl 'pressed locking pin 76. to the outer end of which the handle 7G is secured. he pin 76 is provided with a iiange bearing against the dctent pawl 80', and with a proiection extending into a slot in the pawl and locking?, it in position until the operator draws the handle 7G outward, preparatory to adjusting' the dial T5 and connected parts.

As will be observed, the movement of the handle /l actuating the hollow shaft 6'? will he communicated through the connecting to the driving shaft 26, and will cause the same to swing upon its bearings 24 and thereby to control the speed of rotation of the wort, and also the movement of the handle 7G will cause a corresi'ionding movement of the shaft 65, which will also be communicated thrcueh the connecting gears to the driving shaft' 20, and will cause the .same to swing upon its bearings 18 thereby controlling the feed of the table.

lt will thus be seen that if for any reason the operator desires to move the table more rapidly, or to decrease such speed, he can very easily accomplish this by means of the proper adjustment of the' handle 76, and also ir he desires for any reason to increase or diminish the speed of rotation of the work, this can he readily accomplished by the proper movement of the handle 73. By coordinating the two speeds, it i5 thus apparent that theproper combination can he very quickly and readily secured. The ri ,frht hand of the operator is left free. and all adjustments of the handles are quickly and readily accomplished by the use of the left hand of the operator, as well as the adjustment of the lever 59,. which is also in close proximity to the handles of the dials, and which permits the driving mechanism to be instantly stopped or started without affecting the grinding wheel. There is no complication about the operation of this controlling mechanism, and the use of the same, even in the hands of a comparatively inexperienced op crater, increases the output by reducing settingaip time, by making' correct speed and feed combinations quickly available, and by providing for rapid changes for different diameters on the same piece.

The preferred mode of operation is as follows: After the work has been duly placed into operative position upon the head and foot stocks, `the handles 73 and 76 are carefully adjusted to the character of the work, and both the. variable mechanisms are started by turning the leven 5). Prior to this, the grinding` wheel mechanism should also have been carefully adjusted and started, and should ordinarilv be kept running during the entire operation', it being independent of both the variable speed mechanisms and not needing to be stopped when thev are stopped or adjusted. Should it be found that further adjustments of the speeds are necessary or desirable. such adjustments can be readily made and correct speed combinations quickly effected. Upon completion of the grinding' operatil'ln, or during;v any stage thereof, the variable mechanisms may be stopped at any time'by the hand levez' 5f).

lli/Thilo it is preferred to employ the specific construction and arrangement of parts shown and described. it will be understood that this construction and arrangement not essential to the broader features of the invention. and may be varied or modified as found desirable or best suited to the construction of the machine in which the invention is to be embodied.

l'lavinpv explained the nature and object of the invention. and specilically described one form of mechanisni in which it may be embodied. what is claimed is l. fr `nrindinpr machine, having'. in combination, feedingr mechanisms for effecting the travel of the work and grinding wheel relative to each other mechanism for rotating the work, and adjustingdevices arranged adjacent to each other within convenient reach of the operator and operatively connected to said mechanisms to independently vary the feed and the speed of rotation of the work.

2. A grinding machine, having'. in combination. feeding mechanism for-effecting: at variable speeds the travel of the work and grimlinp` wheel relative to each other, mechanism for rotating` the work at variable speeds, and manually controlled adjusting devices mounted to turn about a common axis within, convenient reach of the opera- JOO tor and operatively connected with said mechanisnis -toi' independently adjusting each of said variable speeds through the mechanism controlling the saine.

3. A grinding machine, having, in combination, feeding mechanism for effecting at "ariable speeds the ti'avel of the. work and grinding wheel relative to each other, mechanism for rotating the woi'k at vai'iable speeds, two concenti'ic shafts, and means at the forward ends of said shafts within convenient reach of the operator for manually adjusting` the saine, each of said shafts being operatively connected at itsl reai' end with one of said mechanisms and controlling the said variations of speed actuated thereby.

i. A grinding machine, having` in combination. feeding mechanism for etl'ecting at variable speeds the travel of the work and gi'indiiig wheel relative to each other, meehanisni for i'otating the work at variable speeds, two independently operated concenti'ic shafts, and two concentric dials at the forward ends of said shafts within eonveiiient reach of the operator for manually adjusting said shafts, each of said shafts being operatively connected at its i'ear end with one of said mechanisms and controlling the said variations of speed actuated thereby. I

5. A grinding machine, having. in combination, feeding mechanism for effecting at variable speeds the travel of the work and grinding wheel relative to each other. mechanism for rotating the work at variable speeds, two independently operated concentric shafts, two concentric d ials, each of which is mounted upon the forward end of onel of said shafts :iiiil.iii i\':ilile` therewith and serving to adjust the saine, a stationary dial located between said incurable dials and concentric therewith, the i'eai' of each shaft being operatively connected at its rear end with onel of said mechanisms and controliing the saine, and said dialsl being within convenient reach of the hand of the operator.

G. A grinding machine, having. in combination, mechanism for eil'ecting the travel of the work and grinding wheel relative. to

cach other, mechanism for rotating the. work, two independent mechanisms, one for varying the speed of said relative travel of the work and grinding wheel and the other for vai' \'ing the speed of rotation of thc work, a gear segment operatively connected to adjust each of said infilependent .mechanisms and controlling the variable speed produced by the same, two concentric shafts, and a geai' at th.` end of each of said shafts meshing with one of said gear segments and serving to operate the saine.

7. A grinding machine, having, in combination, friction disk mechanism for effecting a .movable driving shaft and a fixed driven shaft and friction disks cai'ried upon each of said shafts and operatively in contact, a gear segment operatively connected to adjust each of said movable driving shafts, two independently operated concentric shafts, and a gear at the rear end of each of said shafts meshing with one of said gan' segments and sciiving to operate the saine.

S). A grinding machine, having, in combination, friction disk mechanism for effecting the relative travel of the work and grinding wheel, friction disk mechanism for rotating the work, each disk mechanism having a movable drifting shaft journaled in swinging bearings and a fixed driven shaft and friction disks carried upon each of said shafts and operatively in contact, a gear segment operatively connected to each of said swinging bearings, two independently operated coiicentric shafts, a gea at the rear end of each of said shafts and meshing with one of said gear segments and serving to operate the saine, and means within convenient reach f of the operator for manually controlling the rotation of said shafts.

10. A grinding machine, having, incombination, friction disk mechanism for effecting the relative travel of the work and grinding wheel, friction disk mechanism for rotating the work, each disk mechanism hav-- ing a movable driving shaft and a fixed driven shaft and friction disks carried upon each of said shafts and operatively in centact, a gear segment operatively connected to adjust each of said movable driving shafts, two independently operated concentric shafts, a gear at the rear end of each of said shafts and meshing with one of said gear segments and serving to operate the same, a lever for stopping and starting the operation ot' said disk mechanism, and means within convenient i'each of the operator for manually controlling said lever and the rotation ot said shafts. f

11. A grinding machine, having, in comhination` friction diskfniechanism for effecting the relative travel of the work and grinding wheel, friction disk mechanism for rotating the work, each disk mechanism having a movable driving shaft and a fixed driven shaft and friction disks carried upon each of said shafts and operatively in contact, a gear segment operatively connected to adjust eaclrof said movable driving shafts, two independently operated concentric shafts, a gear at the rear end of each of ysaid shafts and meshing with one of said gear segments and serving to operate the same, a lever for stopping and starting the operation of said disk mechanism, concentric dials on the forward ends of said shafts for control-a ling the rotation of the same, and a handle operatively crnnectcd with said lever and in close proximity with said dials at the front of the machine, whereby all the said controlling means for operating the machine are within convenient reachof the operator.

l2. A grinding machine, having, in combination, variable feeding mechanism for effecting the travel of the work and grinding wheel relative to each other, variable mechanism for rotating the work independent of said feeding mechanism, manually controlled means operatively connected with said mechanisms for adjusting the same, and coperating scales indicating the revolutions per minute of the work and the rate of feed in inches per minute.

13. r- 'grinding machine, having, in com` bination, feeding mechanism for effecting at variable speeds the travel of the work and grinding wheel relative to each other, mech-v anism for rotating the work at variable speeds and manually controlled adjusting devices mounted to turn about a common axis within convenient reach of the operator, and operatively connected wi-th said mechanisms for independently adjusting each of said variable speeds through the mechanism controlling the same, and cooperating scales indicating the revolutions per minute of the Work and rate of feed in inches per minute.

14. A grinding machine, having, in combination, feeding mechanism for effecting at variable speeds the travel of the work and grinding-wheel. relative to each other, mechanism for rotating the Work at variable speeds, two independently operated concentric shafts and two concentric dials at the forward ends of said shafts Within convenient reach of the operatorfor manually adjusting said shafts, eachof said shafts being operatively connected at 'its rear end with one of said mechanisms and controlling the said ,'ariations of speed actuated thereby, one of said dials indicating the number of revolutions per minute of the work and the other dial indicating the rate of feed in inches per minute.

l5. A grinding machine, having, in combination, feeding mechanism for effecting at variable speeds the travel of the work and grinding wheel relatively. to each other, mechanism for rotating the work at variablrv speeds, two concentric shafts, means at the forward ends of said shafts within convenient reach of the operator for normally locking them in position and for manually releasing and adjusting the same, and means at the rear ends of the shafts for connecting them respectively with the variable speed mechanisms.

16. A grinding machine, having, in combination, feeding mechanism for effecting at variable speeds the travel of the work and grinding wheel relative to each other, mechanism for rotating the work at variable speeds, two concentric shafts having their rear ends connected respectively with said mechanism, two concentric dials on the forward ends of the shafts, a stationary rim between the 'dials provided with teeth on its opposite sides, spring pressed detent pawls mounted in the dials to engage the teeth, and spring pressed locking pins for the' pawls provided with operating handles at their outer ends.

JOHF J. THACHER.

R 1Witnesses PHILIP S. XVALKER, ANNIE L. CONNOR. 

